The club became Turkish champions for the 22nd time in their history, and won a second consecutive Süper Lig title following their success in the previous season.

In Europe, Galatasaray competed in the UEFA Champions League, as well as the UEFA Europa League, the Turkish Cup and the Turkish Super Cup.

The season covered a period from 1 July 2018 to 30 June 2019.

Companies that Galatasaray had sponsorship deals with during the season included the following.

Not eligible to play matches Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.